Where I come from, “storm windows” are removable glass or plastic panels which you slide into tracks on the window or door frame, in front of the screen, during the winter months. They provide extra insulation and protection from heavy rains. When the weather gets nice, you remove the storm windows. I found this to be quite possibly the most useless and absurd of all childhood chores, and vowed that when I got my own house I would have windows with the amazing property of actually keeping the weather out, no matter the type, without additional work.